<template>
 <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
        <!-- 提示区域 -->
        <el-alert
            title="添加商品信息"
            type="info"
            center
            show-icon :closable="false">
        </el-alert>
        <!-- 步骤条 -->
        <el-steps :space="200" :active="activeIndex -0" 
        finish-status="success"
        align-center>
            <el-step title="基本信息"></el-step>
            <el-step title="商品参数"></el-step>
            <el-step title="商品属性"></el-step>
            <el-step title="商品图片"></el-step>
            <el-step title="商品内容"></el-step>
            <el-step title="完成"></el-step>
        </el-steps>

        <!-- table栏区域 -->
        <el-form :model="addForm" :rules="addFormRules"
         ref="addFormRef" label-width="100px" label-position="top">
            <el-tabs v-model="activeIndex" :tab-position="'left'" 
            :before-leave="beforeTabLeave" @tab-click="tabClicked">
                <el-tab-pane label="基本信息" name="0">
                    <el-form-item label="商品名称" prop="goods_name">
                        <el-input v-model="addForm.goods_name">
                        </el-input>
                    </el-form-item>
                    <el-form-item label="商品价格" prop="goods_price">
                        <el-input v-model="addForm.goods_price" 
                        type="number">
                        </el-input>
                    </el-form-item>
                    <el-form-item label="商品重量" prop="goods_weight">
                        <el-input v-model="addForm.goods_weight"
                        type="number">
                        </el-input>
                    </el-form-item>
                    <el-form-item label="商品数量" prop="goods_number">
                        <el-input v-model="addForm.goods_number"
                        type="number">
                        </el-input>
                    </el-form-item>

                    <el-form-item label="商品分类" prop="goods_cat">
                        <el-cascader
                            expand-trigger="hover"
                            :options="catelist"
                            :props="cateProps"
                            v-model="addForm.goods_cat"
                            @change="handleChange">
                        </el-cascader>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品参数" name="1">
                    <el-form-item :label="item.attr_name" v-for="item in manyTableData"
                    :key="item.attr_id">
                        <!-- 复选框组 -->
                        <el-checkbox-group v-model="item.attr_vals">
                            <el-checkbox :label="cb"
                            v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox>
                        </el-checkbox-group>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品属性" name="2">
                    <el-form-item :label="item.attr_name" v-for="item in onlyTableData"
                    :key="item.attr_id">
                        <el-input v-model="item.attr_vals"></el-input>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品图片" name="3">
                    <!-- 上传图片 -->
                    <el-upload
                        :action="uploadURL"
                        :on-preview="handlePreview"
                        :on-remove="handleRemove"
                        list-type="picture"
                        :headers="headerObj"
                        :on-success="handleSuccess">
                        <el-button size="small" type="primary">点击上传</el-button>
                    </el-upload>
                </el-tab-pane>
                <el-tab-pane label="商品内容" name="4">
                    <!-- 富文本编辑器 -->
                    <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                    <!-- 添加商品的按钮 -->
                    <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                </el-tab-pane>
            </el-tabs>
        </el-form>
    </el-card>
    <!-- 图片预览 -->
    <el-dialog
        title="图片预览"
        :visible.sync="previewVisible"
        width="50%">
        <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
 </div>
</template>

<script>
import _ from 'lodash'
 export default {
     data(){
         return{
             activeIndex:'0',
             //添加商品的表单数据对象
             addForm:{
                 goods_name:'',
                 goods_price:0,
                 goods_weight:0,
                 goods_number:0,
                 //商品所属的分类数组
                 goods_cat:[],
                 pics:[],
                 goods_introduce:'',
                 attrs:[]

             },
                 
             addFormRules:{
                 goods_name:[
                     {required:true, message:'请输入商品名称', 
                     trigger:'blur'}
                 ],
                 goods_price:[
                      {required:true, message:'请输入商品价格', 
                     trigger:'blur'}
                 ],
                 goods_weight:[
                     {required:true, message:'请输入商品重量', 
                     trigger:'blur'}
                 ],
                 goods_number:[
                     {required:true, message:'请输入商品数量', 
                     trigger:'blur'} 
                 ],
                 goods_cat:[
                     {required:true, message:'请选择商品分类', 
                     trigger:'blur'} 
                 ]
             },
             //商品分类列表
             catelist:[],
             cateProps:{
                 label:'cat_name',
                 value:'cat_id',
                 children:'children'
             },
             //动态参数列表数据
             manyTableData:[],
             //静态属性列表数据
             onlyTableData:[],
             uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
             //图片上传组件的请求头对象
             headerObj:{
                 Authorization:window.sessionStorage.getItem('token')
             },
             previewPath:'',
             previewVisible:false


         }
     },
     created(){
         this.getCateList()
     },
     methods:{
            async getCateList(){
              const {data:res}=await this.$http.get('categories')
             if(res.meta.status!==200){
                  return this.$message.error('获取商品分类失败')
             }
             //数据列表赋值给catelist
             this.catelist =res.data
            
            },
            //选择项变化触发这个函数
            handleChange(){
                if(this.addForm.goods_cat.length!==3){
                    this.addForm.goods_cat=[]
                }

            },
            beforeTabLeave(activeName,oldActiveName){
                if(oldActiveName==='0' && this.addForm.goods_cat.length!==3){
                     this.$message.error('请先选择商品分类！')
                    return false
                }
            },
            async tabClicked(){
                if(this.activeIndex==='1'){
                    const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,{
                        params:{
                            sel:'many'
                        }
                    })
                    if(res.meta.status !==200){
                    return this.$message.error('获取动态参数列表失败')
                    }
                    res.data.forEach(item=>{
                        item.attr_vals=item.attr_vals.length===0 ? [] : item.attr_vals.split(' ')
                        
                    })
                    this.manyTableData = res.data
                    
                }else if(this.activeIndex==='2'){
                    const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,{
                        params:{
                            sel:'only'
                        }
                    })
                    if(res.meta.status !==200){
                    return this.$message.error('获取静态属性失败')
                    }
                    this.onlyTableData = res.data
                }
            },
            //处理图片预览效果
            handlePreview(file){
                this.previewPath =file.response.data.url
                this.previewVisible=true
            },
            //处理移除图片的操作
            handleRemove(){
                //获取删除的图片的临时路径
                const filePath=file.response.data.tem_path
                //从pics数组中找到该图片的索引值
                const i=this.addForm.pice.findIndex(x=>{
                    x.pic===filePath
                })
                //调用数组的splice方法，把数组信息对象从pics数组中删除
                this.addForm.pics.splice(i,1)
            },
            //监听图片上传成功的事件
            handleSuccess(response){
                //拼接得到一个图片信息对象
                const picInfo = {pic:response.data.tmp_path}
                //将图片信息对象push到pics数组中
                this.addForm.pics.push(picInfo)
            },
            add(){
                this.$refs.addFormRef.validate( async valid=>{
                    if(!valid) {
                        return this.$message.error('请输填写必要的表单项目！')
                    }
                    const form=_.cloneDeep(this.addForm)
                    form.goods_cat=form.goods_cat.join(',')
                    this.manyTableData.forEach(item=>{
                        const newInfo = {
                            attr_id: item.attr_id,
                            attr_value: item.attr_vals.join(' ')
                        }
                        this.addForm.attrs.push(newInfo)
                    })

                    this.onlyTableData.forEach(item=>{
                        const newInfo={
                            attr_id: item.attr_id,
                            attr_value: item.attr_vals
                        }
                        this.addForm.attrs.push(newInfo)
                    })
                    form.attrs=this.addForm.attrs
                    //发起请求添加商品
                    //商品名称必须唯一
                    const {data:res} =await this.$http.post('goods',form)
                    if(res.meta.status!==201){
                        return this.$message.error('添加商品失败')
                    }
                     this.$message.success('添加商品成功')
                     this.$router.push('/goods')
                })
            }
        
     },
     computed:{
         cateId(){
             if(this.addForm.goods_cat.length===3){
                 return this.addForm.goods_cat[2]
             }
             return null
         }
     }

 }
 </script>
<style lang="less"   scoped>
.el-checkbox{
    margin:0 5px 0 0 !important;
}
.previewImg{
    widows: 100%;
}

.btnAdd{
    margin-top: 15px;
}
</style>